Objective This study aimed to investigate the antimicrobial resistance profiles of bacterial strains isolated from pediatric intensive care units(PICU)in China for better antimicrobial therapy.Methods Clinical isolates were collected from 17 institutions,including tertiary care children's hospitals and pediatric department of tertiary general hospitals in China from January 1,2020 to December 31,2022.Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were interpreted according to the breakpoints released by the Clinical and Laboratory Standards Institute(CLSI)in 2020.Results A total of 10 688 isolates were collected,including gram-positive organisms(39.2％)and gram-negative organisms(60.8％).The top three organisms were S.aureus(13.6％,1 453/10 688),A.baumannii(10.0％,1 067/10 688),and coagulase-negative Staphylococcus(9.9％,1 058/10 688).Multi-drug resistant organisms(MDROs)were very common in children.The prevalence of methicillin-resistant Staphylococcus aureus(MRSA),carbapenem-resistant Enterobacterales(CRE),carbapenem-resistant E.coli,carbapenem-resistant K.pneumoniae(CRKP),carbapenem-resistant A.baumannii(CRAB),and carbapenem-resistant P.aeruginosa(CRPA)was 41.1％,19.4％,8.8％,30.9％,67.4％,and 28.8％,respectively.Overall,more than 50％of Enterobacteriales isolates were resistant to cephalosporins,while nearly 25％of Enterobacteriales isolates were resistant to carbapenems.MDROs were highly resistant to commonly used antibiotics.More than 80％of CRE and CRAB strains were resistant to all beta-lactam antibiotics.CRE and CRAB showed low resistance rates to tigecycline and polymyxin.CRPA showed lower resistance rates to piperacillin,beta-lactamase inhibitor combinations than the resistance rates to third and fourth generation cephalosporins.All of the Staphylococcus and Enterococcus isolates were susceptible to vancomycin and tigecycline.None of PRSP strains isolated from meningitis and nonmeningitis samples were resistant to rifampicin,vancomycin,or linezolid.The prevalence of β-lactamase-negative ampicillin-resistant(BLNAR)strains was 43.3％in Haemophilus influenzae.Conclusions MDROs were prevalent in PICU.It is necessary to establish an effective multidisciplinary team(MDT)to control the antimicrobial resistance.

OBJECTIVE T o explore the long-term effect of multidimensional evidence-based interventions based on i-PARIHS theoretical framework on reduction of incidence of central line-associated bloodstream infections(CLABSI)in pediatric intensive care units(PICU)of pediatrics department and evaluate the impact on nurses'compliance to taking the interventions and use intensity of catheters.METHODS By means of quasi-experimental design,the multidimensional intervention system covering multidisciplinary collaboration,standardized operation procedures,information system optimization and hierarchical training was established and staged for implementa-tion of 5 years(from T0 baseline stage to T3 maintenance stage).The variations in implementation rates of cathe-ter maintenance(daily maintenance,dressings change,catheter removal)were analyzed by Chi-square test,and the change of incidence of CLABSI was monitored with the use of statistical process control U chart.RESULTS The nurses'compliance to operations was remarkably improved(P＜0.05)o The implementation rate of dressings change continuously increased from 52.91％in T0 to81.62％in T3(x2=72.444,P＜0.001),the implementa-tion rate of catheter removal increased from 48.72％to 79.31％(x2=8.179,P=0.042).The incidence rate of CLABSI decreased from 1.92％0 in 2019 to 0.5％0 in 2022,and the control chart showed that most of the months fluctuated within control limits.CONCLUSIONS The multidimensional evidence-based interventions can achieve a long term control of CLABSI by raising the nurses' compliance to operations.The information monitoring and closed-loop management are crucial to maintenance of the interventional effect,and the risk early warning system should be optimized with the combination of artificial intelligence technology.

OBJECTIVE T o explore the long-term effect of multidimensional evidence-based interventions based on i-PARIHS theoretical framework on reduction of incidence of central line-associated bloodstream infections(CLABSI)in pediatric intensive care units(PICU)of pediatrics department and evaluate the impact on nurses'compliance to taking the interventions and use intensity of catheters.METHODS By means of quasi-experimental design,the multidimensional intervention system covering multidisciplinary collaboration,standardized operation procedures,information system optimization and hierarchical training was established and staged for implementa-tion of 5 years(from T0 baseline stage to T3 maintenance stage).The variations in implementation rates of cathe-ter maintenance(daily maintenance,dressings change,catheter removal)were analyzed by Chi-square test,and the change of incidence of CLABSI was monitored with the use of statistical process control U chart.RESULTS The nurses'compliance to operations was remarkably improved(P＜0.05)o The implementation rate of dressings change continuously increased from 52.91％in T0 to81.62％in T3(x2=72.444,P＜0.001),the implementa-tion rate of catheter removal increased from 48.72％to 79.31％(x2=8.179,P=0.042).The incidence rate of CLABSI decreased from 1.92％0 in 2019 to 0.5％0 in 2022,and the control chart showed that most of the months fluctuated within control limits.CONCLUSIONS The multidimensional evidence-based interventions can achieve a long term control of CLABSI by raising the nurses' compliance to operations.The information monitoring and closed-loop management are crucial to maintenance of the interventional effect,and the risk early warning system should be optimized with the combination of artificial intelligence technology.

Objective This study aimed to investigate the antimicrobial resistance profiles of bacterial strains isolated from pediatric intensive care units(PICU)in China for better antimicrobial therapy.Methods Clinical isolates were collected from 17 institutions,including tertiary care children's hospitals and pediatric department of tertiary general hospitals in China from January 1,2020 to December 31,2022.Antimicrobial susceptibility testing was carried out according to a unified protocol using Kirby-Bauer method or automated systems.Results were interpreted according to the breakpoints released by the Clinical and Laboratory Standards Institute(CLSI)in 2020.Results A total of 10 688 isolates were collected,including gram-positive organisms(39.2％)and gram-negative organisms(60.8％).The top three organisms were S.aureus(13.6％,1 453/10 688),A.baumannii(10.0％,1 067/10 688),and coagulase-negative Staphylococcus(9.9％,1 058/10 688).Multi-drug resistant organisms(MDROs)were very common in children.The prevalence of methicillin-resistant Staphylococcus aureus(MRSA),carbapenem-resistant Enterobacterales(CRE),carbapenem-resistant E.coli,carbapenem-resistant K.pneumoniae(CRKP),carbapenem-resistant A.baumannii(CRAB),and carbapenem-resistant P.aeruginosa(CRPA)was 41.1％,19.4％,8.8％,30.9％,67.4％,and 28.8％,respectively.Overall,more than 50％of Enterobacteriales isolates were resistant to cephalosporins,while nearly 25％of Enterobacteriales isolates were resistant to carbapenems.MDROs were highly resistant to commonly used antibiotics.More than 80％of CRE and CRAB strains were resistant to all beta-lactam antibiotics.CRE and CRAB showed low resistance rates to tigecycline and polymyxin.CRPA showed lower resistance rates to piperacillin,beta-lactamase inhibitor combinations than the resistance rates to third and fourth generation cephalosporins.All of the Staphylococcus and Enterococcus isolates were susceptible to vancomycin and tigecycline.None of PRSP strains isolated from meningitis and nonmeningitis samples were resistant to rifampicin,vancomycin,or linezolid.The prevalence of β-lactamase-negative ampicillin-resistant(BLNAR)strains was 43.3％in Haemophilus influenzae.Conclusions MDROs were prevalent in PICU.It is necessary to establish an effective multidisciplinary team(MDT)to control the antimicrobial resistance.

Objective:To investigate the clinical, skeletal muscle pathological, and genetic characteristics of fatal infantile hypertonic myofibrillar myopathy (FIHMM).Methods:The clinical manifestations, laboratory assessments data and gene sequencing results of 10 patients diagnosed with FIHMM in Shenzhen Children′s Hospital from February 2017 to April 2021 were retrospectively analyzed.Magnetic resonance imaging (MRI) of both musculoskeletal system and the brain, and electromyogram (EMG) were performed in 3 cases, while muscle biopsy was performed in 2 cases.Results:Among these 10 cases, 1 case was from Northeast China and 1 case from East China, while the rest 8 cases were from South China.Eight of the 10 patients were male, and the other 2 cases were female.They were all born normal and not related to each other.The age of onset varied from 2 to 12 months.The main clinical manifestations for all the patients were progressive rigidity of the rectus abdominis (8 cases), neck muscles (7 cases), rectus abdominis (2 cases) and intercostal muscles (1 case), resulting in respiratory failure.Mildly to moderately elevated serum creatine kinase level was detected (436-5 804 IU/L) (reference range: 24-229 IU/L). Complex repetitive discharges can be seen in the EMG, without any myotonic potential.Muscle fiber degeneration, necrosis, and vacuolar degeneration were noted in the histopathological examination of the vastus lateralis and rectus abdominis.An abnormal red granular deposit was observed in a portion of the field of the modified Gomory Trichrome staining.Immunohistochemistry showed substantial deposition of desmin.Under the electron microscopy, the sarcomere structure of the muscle fibers was seriously disordered, with the destruction of Z-bands and the presence of granular deposits.The whole-exome sequencing identified the same homozygous variation c. 3G>A, p.Met1? of CRYAB gene in all the patients, but heterozygous variation in their parents. Conclusions:Axial muscles involvement, such as rectus abdominis rigidity, is the main clinical characteristic of FIHMM.c.3G>A, p.Met1? mutation in the CRYAB gene is a hotspot mutation in Chinese children.

Objective To analyze the clinical characteristics of Kawasaki disease shock syndrome ( KDSS) and to improve the diagnosis,treatment and prognosis of patients. Methods A total of 924 cases of Kawasaki disease ( KD) hospitalized from January 2013 to April 2017 in our hospital were retrospectively an-alyzed,including 16 children with KDSS. And 30 patients with KD were randomly selected as the control group. The clinical characteristics,laboratory examination and treatment of the two groups were compared and analyzed. Results There were 9 males and 7 females in KDSS group,and average age was (3. 95 ± 2. 56) years. The average time to happen shock was (4. 31 ± 0. 79) days. There were no significant differences in gender,age and duration of fever between KDSS group and KD group respectively ( P >0. 05 ) . KDSS patients were more likely to develop abdominal pain, hepatic injury ( including elevated transaminase and jaundice),proteinuria,peritoneal effusion,pneumonia,coronary aneurysm,IVIG resistance and longer hospi-talization (P<0. 05). WBC[(28. 42 ± 10. 46) × 109/L vs. (20. 34 ± 7. 57) × 109/L],the neutrophils [(89.86 ± 7.00)％ vs. (73.14 ± 13.91)％],hsCRP (mg/L) [181.95(141.58,218.00) vs.94.65 (55. 33,109. 50)],PCT(ng/ml)[9. 68 (4. 85,12. 07) vs. 0. 09 (0. 04,0. 37)] and serum ferritin (ng/ml) [(388. 12 ± 241. 75) vs. (169. 86 ± 95. 14)] in the KDSS group was significantly higher than those in KD group (P<0. 05). There were no differences in ESR(mm/h) [(75. 71 ± 25. 25) vs. (79. 87 ± 22. 76)], fibrinogen (g/L) [(6. 17 ± 1. 45) vs. (6. 03 ± 1. 47)] between two groups (P>0. 05). The levels of plate-let count[ (655. 50 ± 226. 98) × 109/L vs. (549. 93 ± 119. 15) × 109/L],the albumin (g/L) [(22. 54 ±5.13)vs.(33.32±3.18)],serumsodium(mmol/L)[(130.47±2.79)vs.(134.77±2.81)]andserumpotassi-um (mmol/L) [(4. 59 ± 0. 74) vs. (4. 04 ± 0. 43)] and ejection fraction [(60. 16 ± 6. 18)％ vs. (64. 81 ± 3. 71)％] in KDSS group were lower than those in KD group (P<0. 05). During the course of treatment,14 patients were accepted fluid resuscitation and the average volume of fluid was (27. 19 ± 19. 58) ml/kg. Ten patients used vasoactive drugs. Six patients were treated with hormone ( methylprednisolone ) . All patients were discharged from hospital. Conclusion KDSS is a serious form of KD,the indicators of inflammatory response increased more obviously. Organ damage occurs more frequently,and often accompanies abdominal pain. Anti-shock treatment often requires fluid resuscitation and use of vasoactive drugs.

Nowadays severe influenza is still the main disease threatening the health of children.Influenza virus infection is mainly involved in the human respiratory system,the clinical manifestations are mainly respiratory symptoms,but the influenza virus can also cause systemic disease,especially in patients with severe influenza is often associated with multi system involvement.This paper will introduce influenza associated hemophagocytic syndrome,influenza associated encephalopathy,influenza associated viral myocarditis,influenza associated renal complications,influenza associated complications of digestive system,influenza associated rhabdomyolysis.

Objective To discuss the influence of microRNA(miR)-155/miR-21 on toll-like receptor 4 (TLR4) in children with sepsis.Methods Fifty children with sepsis who were hospita-lized in Pediatric Intensive Care Unit,Shenzhen Children's Hospital,were enrolled in the study,and 15 healthy children at the same age were selected as healthy control group.Expression levels of TLR4 protein and human leukocyte antigen(HLA)-DR in CD14 + monocytes (MC) were detected by using flow cytometry,and sepsis patients were divided into 2 groups according to whether they exceeded the value of HLA-DR by 30％ or not.Expression level of programmed cell death factor 4 (PDCDM) and inositol phosphatases 1 containing SH2 (SHIP1) were detected at the same time.MC were separated by CD14 + immune magnetic bead,and expression level of miR-155,miR-21 and tumor necrosis factor-α (TNF-α),interleukin-10 (IL-10) mRNA in CD14 + MC were detected by using real-time fluorescent quantitative PCR.Results Sepsis group consisted of 27 male and 23 female,and their ages were (2.34 ± 0.79) years old,among whom 9 patients died.There were 36 patients in the HLA-DR increase group and 14 patients in the HLA-DR decrease group.Expressions ofTLR4(2.33±0.90),miR-155[(7.19±3.75) ×10 3] and TNF-α[(21.98±14.15) ×10-2 pg/L] in CD14 + MC were higher in the HLA-DR increase group than those in the HLA-DR decrease group [1.24±0.60,(4.83 ±1.17) × 10-3,(14.18±5.45) ×10-2 μg/L] and healthy control group[1.57±0.55,(3.99 ± 1.29) × 10-3,(1.61 ± 0.84) × 10 2 pg/L],and the differences were statistically significant(F =11.943,7.583,18.538,all P ＜0.05),while the expressions of miR-21 (12.10 ±5.66),IL-10[(29.74 ± 12.55) × 10-4 μg/L] in CD14 + MC were lower in the HLA-DR increase group than those in the HLA-DR decrease group[4.68 ± 2.07,(12.50 ± 5.73) × 10-4 μg/L] and healthy control group [2.39 ± 0.86,(2.04 ± 0.92) × 10-4 μg/L],and the differences were statistically significant(F =41.673,54.991,all P ＜ 0.05).The levels of SH1P1 and PDCD4 decreased in sepsis compared with healthy control group[0.70 ±0.36)vs.(1.59 ±0.48);(1.55 ±0.56) vs.(3.01 ±0.70)],and the differences were statistically significant (t =7.682,8.339,all P ＜ 0.05),but SHIP1 decreased more significantly in the HLA-DR increase group than that in the HLA-DR decrease group [(0.60 ± 0.34) vs.(0.97 ± 0.26)],and the difference was statistically significant (F =39.214,P ＜ 0.05).PDCD4 decreased more significantly in the HLA-DR decrease group than that in the HLA-DR increase group (0.94 ±0.19 vs.1.79 ±0.47),the difference was statistically significant(F =65.367,P ＜ 0.05).Conclusions Regulation imbalance of miR-155/miR-21 may be one of the reasons for abnormal expression of TLR4 in children with sepsis,and it plays a role in enlarged or inhibited expression of TLR4 in the sepsis process which results in different immune status in sepsis patients.

Objective To investigate the expression of miR-146a in CD14+ monocytes (MC) of children with sepsis.Methods Forty children with sepsis in PICU were enrolled in the study.Fifteen children with systemic inflammatory response syndrome (SIRS) afteRsurgical treatment and fifteen healthy children were selected as control group.Expressions of miR-146a and TNF-α,IL-10 of CD14+ MC were detected by real-time quantitative PCR(qRT-PCR).HLA-DRlevels of CD14+ MC were detected by flow cytometry.Levels of high-sensitivity C-reactive protein (CRP) and procalcitonin (PCT) were detected.Results The HLA-DRlevels of CD14+ MC in all the children with sepsis were oveR30%.The miR-146a level of CD14+ MC were significantly higheRin sepsis group than SIRS group and healthy controls (P<0.05),and the level decreased when sepsis children were recovered (P<0.05).The TNF-α,IL-10 level of CD14+ MC in children with sepsis was significantly higheRthan healthy controls (P<0.05).Conclusion The expressions of CD14+ MC miR-146a in children with sepsis are significantly up-regulated.

Objective To investigate the expression of miR-146a in CD14+ monocytes (MC) of children with sepsis.Methods Forty children with sepsis in PICU were enrolled in the study.Fifteen children with systemic inflammatory response syndrome (SIRS) afteRsurgical treatment and fifteen healthy children were selected as control group.Expressions of miR-146a and TNF-α,IL-10 of CD14+ MC were detected by real-time quantitative PCR(qRT-PCR).HLA-DRlevels of CD14+ MC were detected by flow cytometry.Levels of high-sensitivity C-reactive protein (CRP) and procalcitonin (PCT) were detected.Results The HLA-DRlevels of CD14+ MC in all the children with sepsis were oveR30%.The miR-146a level of CD14+ MC were significantly higheRin sepsis group than SIRS group and healthy controls (P<0.05),and the level decreased when sepsis children were recovered (P<0.05).The TNF-α,IL-10 level of CD14+ MC in children with sepsis was significantly higheRthan healthy controls (P<0.05).Conclusion The expressions of CD14+ MC miR-146a in children with sepsis are significantly up-regulated.